A computer vision expert in Amsterdam used software developed at the University of Illinois at Urbana-Champaign to design emotion recognition technology. With a Web cam, they map a person's face onto a mesh computer model. It calculates the expression based on facial points like lip curvature, eyebrow position, and cheek contraction -- with 85-percent accuracy.

Just in case you're a paranoid Orwellian kind of person and want to mess with the medication you'll be prescribed down the road based on your test results - or you've just forgotten how to smile - here's a public service announcement: